Dry already hit on it...I am NOT advocating that absent Jaden, Zach and Tre would have needed to play together.
To Dry's point...eliminate any/all names...the issue was/is roster composition if you have one of your best players ALWAYS sitting on the bench...it really should never happen, barring some crazy circumstance, and, my point with respect to those individuals mentioned was that it only worked for Purdue because of Ivey's skillset. Irrelevant as it already happened and is what it is, but, the idea that Purdue may yet again have one (or more) of its best players on the bench at ALL times because they can't be on the floor together is an issue...one that already presented, and, one that Painter needs to figure out a way to resolve.
Zach is indeed going to play 25 mpg, but, the idea that Caleb loses minutes as a result just because he is backing him up does not seem like a brilliant plan. And, just being frank, Trey is more talented and a better basketball player than either Mason or Caleb, so, your suggestion (and, I know it is only a guess or what not) that he would see even less minutes due to his game maybe not complementing Zach is an even bigger issue.
Zach is Purdue's literal centerpiece...Trey is probably its next genuine best player...Furst right up there from a talent standpoint...the idea that someone like Morton should/will play more minutes just because he happens to be a different position per se, despite not being nearly as talented, is crazy...it is not because he is better...it is not because his game better complements Zach...it is not because Purdue is better with him on the floor than not...it is merely a means to an end to have someone else on the floor aside of one of the 3 better/best players because of their positions...rather than their skills (and, I say all of that admittedly feeling like Tre can/should/will see time at the 3).
Purdue's strength and best players are in the front court...I don't know how it gets worked out, nor do I need to...that is on Painter...but, in some form or fashion, he needs to find a way to play with those guys on the floor more often than not, and, play through them as well.